Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
It is recommend that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
- With the ignition OFF, disconnect the EBCM connector.
- With the ignition ON, measure for 0 volts between the sensor signal circuit terminal and the low reference circuit and ground at the EBCM connector.
- If over 0 volts, repair short to voltage in sensor signal circuit or the low reference circuit.
- With the ignition OFF, measure for infinite ohms between the wheel speed sensor signal and the low reference circuit and ground at the EBCM connector.
- If less than infinite ohms, repair short to ground in the sensor signal or the low reference circuit.
- Measure for 850-1350 ohms between the wheel speed sensor signal and low reference circuits at the EBCM connector.
- If greater than 1350 ohms test for an open/high resistance in the circuit or faulty wheel speed sensor.
- If less than 850 ohms test for a short between the circuits or faulty wheel speed sensor.
- If all circuits test normal replace the EBCM.